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MCP23017 - i2c 16 input/output port expander : ID 732 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: Waveshare MCP23017 IO Expansion Board I2C Interface Expands 2 Signal Pins as 16 I/O Pins Compatible with 3.3V and 5V Levels : Electronics
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Din Rail Mount Mcp23017 16-channel Gpio Expander With I2c Interface For Arduino Raspberry Pi 3.3v/5v Power - Demo Board Accessories - AliExpress
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Amazon.com: Waveshare MCP23017 IO Expansion Board I2C Interface Expands 2 Signal Pins as 16 I/O Pins Compatible with 3.3V and 5V Levels : Electronics
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Amazon.com: Waveshare MCP23017 IO Expansion Board I2C Interface Expands 2 Signal Pins as 16 I/O Pins Compatible with 3.3V and 5V Levels : Electronics
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